Spatial and seasonal variations of sediment bacterial communities in a river-bay system in South China
Spatial and seasonal variations of sediment bacterial communities in a river-bay system in South China
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DOI：
10.1007/s00253-021-11142-z
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发表时间：
2021-02-05
影响因子：
5
通讯作者：
Li, Meng
中科院分区：
文献类型：
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作者：
Lu, Zhongyi;Liu, Zongbao;Li, Meng
河流-海湾系统是大陆和海洋之间的过渡区域，在海洋地球化学过程中起着重要作用。然而，由这样的环境塑造的微生物群落的组成和结构还不清楚。本研究采用16 S rRNA基因高通量测序技术分析了深圳河湾系统干湿季沉积物细菌群落的多样性和组成。结果表明，沉积物细菌群落结构因生境（河流与河口）和季节（丰水期与枯水期）而异。沉积物细菌群落α多样性在枯水期显著高于丰水期，而河流与河口的α多样性差异不显著。中性群落模型揭示了随机过程对沉积物细菌群落的影响，特别是在雨季。然而，β最近分类单元指数表明，确定性过程更负责沉积物细菌群落的组装。冗余度分析表明，深圳河湾系统沉积物细菌群落结构与环境因子之间存在密切联系，环境因子对细菌群落结构变异的解释率为63.5%。具体而言，NH 4+，pH值和盐度是三个最重要的贡献因素，塑造了沉积物细菌群落。总体而言，本研究提供了一个有价值的参考，以了解在一个典型的河流-海湾系统的沉积物细菌群落的时空格局。
River-bay systems are transitional areas that hold important roles in biogeochemical processes between continents and oceans. However, composition and structure of microbial communities shaped by such environments have not been clear yet. In this study, we used high-throughput sequencing of 16S rRNA genes to analyze the diversity and composition of sediment bacterial communities from the Shenzhen river-bay system during dry and wet seasons. The results showed that sediment bacterial community structure was varied according to habitats (river vs. estuary) and seasons (wet season vs. dry season). The alpha diversity of sediment bacterial community was significantly higher in the dry season than in the wet season, while no significant difference of alpha diversity was found between river and estuary. Neutral community model revealed a significant influence of stochastic processes on sediment bacterial community assembly, especially in the wet season. However, the beta nearest-taxon index indicated that deterministic processes were more responsible for the assembly of sediment bacterial community. Additionally, redundancy analysis suggested strong links between sediment bacterial communities and environmental factors in Shenzhen river-bay system, with the environmental factors explaining 63.5% of the bacterial community variation. Specifically, NH4+, pH, and salinity were the three most important contributing factors that shaped the sediment bacterial communities. Overall, this study provides a valuable reference to get insights into the spatiotemporal pattern of sediment bacterial communities in a typical river-bay system.